Introduction
- To test the Redux Toolkit store, you can use the configureStore function from the Redux Toolkit to create a mock store.
- Then, you can dispatch actions to this store and check if the state changes as expected.
We need to have a separate store.mock.js
import { configureStore } from '@reduxjs/toolkit';
import rootReducer from './path_to_your_reducer'; // replace with the path to your reducer
export const mockStore = configureStore({
reducer: rootReducer,
middleware: getDefaultMiddleware => getDefaultMiddleware(),
});
Then, in your test file, you can import this mock store and use it to dispatch actions and check the state:
import { mockStore } from './store.mock';
import { yourAction } from './path_to_your_actions'; // replace with the path to your actions
describe('Redux Toolkit Store', () => {
it('should handle yourAction', () => {
const expectedState = { /* your expected state after dispatching the action */ };
mockStore.dispatch(yourAction(/* your action payload */));
expect(mockStore.getState()).toEqual(expectedState);
});
});
To Avoid Confusion
when you dispatch an action to the mock store created by configureStore in your tests, it will indeed "hit" the reducer.
The reducer will run with the current state and the dispatched action, and return a new state.
This is the same behavior as in your actual application. However, this does not have any consequences for your** actual application state**.
The mock store you create in your tests is completely separate from the actual Redux store in your application.
-Any actions you dispatch in your tests will not affect the actual application state.
As for clearing the store, it's not necessary to clear the mock store after each test. Each test runs in isolation, and if you create a new mock store in a beforeEach block (as is common practice), each test will get its own fresh instance of the store.
Therefore, the state from one test will not leak into another.
Feel free to reach out to me if you have any queriers.
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